// Draw all the sprites in this buff
void ParticleBuff::renderAll()
{
// ready the very buffer
buildVerts();
// Draw the parts
glBindTexture( GL_TEXTURE_2D, m_texId );
glBindBuffer(GL_ARRAY_BUFFER, this->vbo() );
updateBuffer();
glEnableClientState( GL_VERTEX_ARRAY );
glVertexPointer( 2, GL_FLOAT, sizeof(PartiVert), 0 );
glEnableClientState( GL_TEXTURE_COORD_ARRAY );
glTexCoordPointer( 2, GL_FLOAT, sizeof(PartiVert), (void*)(2*sizeof(GLfloat)) );
glEnableClientState( GL_COLOR_ARRAY );
glColorPointer( 4, GL_FLOAT, sizeof(PartiVert), (void*)(4*sizeof(GLfloat)) );
glDrawArrays( GL_TRIANGLES, 0, this->size() );
glDisableClientState( GL_TEXTURE_COORD_ARRAY );
glDisableClientState( GL_COLOR_ARRAY );
glDisableClientState( GL_VERTEX_ARRAY );
}
void MD5Model::animate(float dt) {
// sanity check #1
if (currAnim < 0 || currAnim >= int(anims.size()) || !anims[currAnim])
throw Exception("MD5Model::animate(): currAnim is invalid");
Anim *anim = anims[currAnim];
// sanity check #2
if (currFrame < 0 || currFrame >= int(anim->numFrames))
throw Exception("MD5Model::animate(): currFrame is invalid");
// compute index of next frame
int nextFrameIndex = currFrame >= anim->numFrames - 1 ? 0 : currFrame + 1;
// update animation time
animTime += dt*float(anim->frameRate);
if (animTime > 1.0f) {
while (animTime > 1.0f)
animTime -= 1.0f;
//setFrame(nextFrameIndex);
currFrame = nextFrameIndex;
nextFrameIndex = currFrame >= anim->numFrames - 1 ? 0 : currFrame + 1;
}
// make sure size of storage for interpolated frame is correct
if (int(interpFrame.joints.size()) != numJoints)
interpFrame.joints.resize(numJoints);
///// now interpolate between the two frames /////
Frame &frame = anim->frames[currFrame],
&nextFrame = anim->frames[nextFrameIndex];
// interpolate between the joints of the current frame and those of the next
// frame and store them in interpFrame
for (int i = 0; i < numJoints; i++) {
Joint &interpJoint = interpFrame.joints[i];
// linearly interpolate between joint positions
float *pos1 = frame.joints[i].pos,
*pos2 = nextFrame.joints[i].pos;
interpJoint.pos[0] = pos1[0] + animTime*(pos2[0] - pos1[0]);
interpJoint.pos[1] = pos1[1] + animTime*(pos2[1] - pos1[1]);
interpJoint.pos[2] = pos1[2] + animTime*(pos2[2] - pos1[2]);
interpJoint.quat = slerp(frame.joints[i].quat, nextFrame.joints[i].quat, animTime);
}
buildVerts(interpFrame);
buildNormals();
calculateRenderData();
}
void MD5Model::loadMesh(const char *filename) {
// sanity check
if (!filename)
throw Exception("MD5Model::loadMesh(): filename is NULL");
// attempt to open file for reading
std::ifstream fin(filename, std::ifstream::in);
// was open successful?
if (!fin.is_open()) {
std::string msg = std::string("MD5Model::loadMesh(): unable to open ") +
std::string(filename) + std::string(" for reading");
throw Exception(msg);
}
// read in file version
std::string str;
getNextToken(fin, &str);
// token must read "MD5Version"
if (str != "MD5Version")
throw Exception("MD5Model::loadMesh(): expected 'MD5Version'");
// get version #
int ver = readInt(fin);
// must be version 10
if (ver != 10)
throw Exception("MD5Model::loadMesh(): MD5Version must be 10");
// clear any data before reading file
clear();
// read in all of the MD5Model elements
readElements(fin);
// close input file (should be done destructor anyway...)
fin.close();
// calculate vertex positions and normals from information in joints
// 模型pose姿势中，多个骨骼节点初始位置+连续weight位置变换（骨骼节点开始的位置 + weightPos经过joint四元数旋转的位置）* 权重 的结果作为顶点的位置。
buildVerts();
// 直接叉乘，规范化，将单位面法向量作为每个顶点的法向量
buildNormals();
createRenderData();
}
void MD5Model::setFrame(int frameIndex) {
// sanity check #1
if (anims.size() == 0 || currAnim < 0)
throw Exception("MD5Model::setFrame(): no animation has beens set");
// sanity check #2
if (frameIndex < 0 || !anims[currAnim] ||
anims[currAnim]->numFrames <= 0 ||
anims[currAnim]->numFrames <= frameIndex)
throw Exception("MD5Model::setFrame(): frame index is invalid");
buildVerts(anims[currAnim]->frames[frameIndex]);
buildNormals();
calculateRenderData();
currFrame = frameIndex;
animTime = 0.0f;
}